Stay-bolt structure.



1'. R. FLANNERY, B. E. D. STAFFORD 62 E. l. DODDS.

STAY BOLT STRUCTURE.

APPLICATION FILED OCT. 25. 191.7.

1,268,827. Patented June 11, 191

W] zvssszs INVENTORS L iTOHN ROGERS FLANNERY, BENJAMIN E. I). STAFFORD, AND ETHAN I. DODDS, OF PITTS- BURG-H, PENNSYLVANIA, ASSIGNORS TO FLANNERY BOLT COMPANY, OF PITTS- BURGH, PENNSYLVANIA.

STAY-BOLT srnuorunn.

Specification of Letters Patent.

Patented June II, 1918.

Application filed October 25, 1917. Serial No. 198,480.

To all whom it may concern:

Be it known that we, J orm R. FLANNERY, BENJAMIN E. D. STAFFORD, and ETHAN I. Donns, citizens of the United States, and residents of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improve ments in Stay-Bolt Structures; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in staybolt structures for boilers and more particularly to means for denoting the condition of the bolt,--the object of the invention being to provide simple means which may be operated manually to ascertain the condition of the bolt.

With this object in view the invention consists in certain novel features of c0nstruction and combinations of arts as hereinafter set forth and pointed out in the claims.

In the accompanying drawings, Figure 1 is a sectional view illustrating an embodiment of our invention and showing the positions which the parts will assume under normal conditions when the bolt is whole. Fig. 2 is a similar view showing the positions which the parts will assume when operated in the event the bolt is ruptured, and Fig. 8 is a detail view.

1 represents a staybolt for boilers having a telltale hole 2, the inner open end of which may be made somewhat conical as shown at 3.

A tube 4: is inserted into the inner end of the telltale hole or bore 2 and one end of this tube may be made flaring or conical as at 5 to fit the conical portion 3 of the bore. The inner end of the tube 4 is made with an opening' 6 and the flaring end of said tube is closed by a conicalplug 7 of suitable materia A piston 8 is located within the tube 4: and provided with a hole 9. A rod or wire 10 is attached to this piston and extends through a suitable hole in the plug 7 ,the free end of said rod or wire being accessible to an operator or attendant. A body 11 of soluble material, such as salt, is located within the tube 4 so as to normally fill the space between the piston 8 and the plug 7.

Under normal conditions, when the bolt is whole, the body of salt 11 will prevent the piston 8 from being moved toward the plug end of the tube and this will indicate that the bolt is in good condition. Should a rupture occur so that moisture would be admitted into the tell-tale bore 2, such moisture would enter the tube 4 through the hole 5 and pass through the hole 9 in the piston 8 to the soluble material 11 and dissolve the latter. Should the attendant now pull the rod or wire 10, the piston 8 would move freely and this would indicate that the bolt is ruptured.

Having fully described our invention what we claim as new and desire to secure by Letters-Patent, is:

1. The combination with a stay-bolt having a tell-tale bore, and a closure for said bore, of a piston in said bore constructed to ermit the passage of fluid, soluble material ocated between said piston and closure, and manually operable means connected with said piston.

2. The combination with a stay bolt having a tell-tale bore and a closure for said bore, of a piston in said bore having a hole therein, soluble material located between said piston and closure, and a manually operable device connected with said piston.

3. The combination with a staybolt having a tell-tale bore, of a tube in said bore having an opening in one end, a closure for the other end of said tube, a piston in the tube having a hole, soluble material in the tube between said piston and closure, and a manually operable device connected with said piston and extending through said closure.

In testimony whereof, we have signed this specification in the presence of two subscribing witnesses.

JOHN ROGERS FLANNERY. BENJAMIN E. D. STAFFORD. ETHAN I. DODDS.

Witnesses:

F. H. ALLISON, EDWIN S. RYGE.

Gopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

